Yamaha YZ450FP 2023, Owner'S Service Manual

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ENGINE SPECIFICATIONS
2-2
EAM20128
ENGINE SPECIFICATIONS
Engine
Combustion cycle 4-stroke
Cooling system Liquid cooled
Valve train DOHC
Displacement 450 cm³
Number of cylinders Single cylinder
Bore

stroke 97.0

60.8 mm (3.82

2.39 in)
Compression ratio 13.0 : 1
Starting system Electric starter
Fuel
Recommended fuel Unleaded gasoline (E10 acceptable)
Octane number (RON) 95
Fuel tank capacity 6.2 L (1.6 US gal, 1.4 Imp.gal)
Engine oil
Recommended brand YAMALUBE
SAE viscosity grades 10W-40, 10W-50, 15W-40, 20W-40 or 20W-50
Recommended engine oil grade API service SG type or higher, JASO standard
MA
Lubrication system Dry sump
Engine oil quantity
Oil change 0.94 L (0.99 US qt, 0.83 Imp.qt)
With oil filter removal 0.96 L (1.01 US qt, 0.84 Imp.qt)
Quantity (disassembled) 1.20 L (1.27 US qt, 1.06 Imp.qt)
Oil filter
Oil filter type Cartridge
Cooling system
Coolant quantity
Radiator (including all routes) 1.03 L (1.09 US qt, 0.91 Imp.qt)
Radiator cap valve opening pressure 107.9–137.3 kPa (1.08–1.37 kgf/cm², 15.6–19.9
psi)
Spark plug(s)
Manufacturer/model NGK/LMAR8G
Spark plug gap 0.7–0.8 mm (0.028–0.031 in)
Cylinder head
Warpage limit 0.05 mm (0.0020 in)
Camshaft
Camshaft cap inside diameter 22.043–22.064 mm (0.8678–0.8687 in)
Camshaft journal diameter 22.002–22.015 mm (0.8662–0.8667 in)
Camshaft-journal-to-camshaft-cap clearance 0.028–0.062 mm (0.0011–0.0024 in)
Camshaft-journal-to-camshaft-cap clearance
limit
0.080 mm (0.0032 in)
Camshaft lobe dimensions
Lobe height limit (Intake) 38.030 mm (1.4972 in)
Lobe height limit (Exhaust) 34.170 mm (1.3453 in)
Valve, valve seat, valve guide
Valve clearance (cold)
Intake 0.10–0.17 mm (0.0039–0.0067 in)